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26 April 2024

» arxiv » arxiv.0706.3591

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Probing the electron-phonon coupling in MgB2 through magnetoresistance measurements in neutron irradiated thin films
M. Monni ; I. Pallecchi ; C. Ferdeghini ; V. Ferrando ; A. Floris ; E. Galleani d'Agliano ; E. Lehmann ; I. Sheikin ; C. Tarantini ; X.X. Xi ; S. Massidda ; M. Putti ;
Date:	25 Jun 2007
Abstract:	We report magnetoresistance (MR) measurements on MgB2 and the corresponding full account from ab-initio calculations; we suggest that this combination can be a useful tool to probe electron- phonon coupling. We obtain good quantitative agreement between high field measurements on neutron irradiated epitaxial thin films and calculations within Bloch-Boltzmann transport theory over a wide range of magnetic fields (0-28 T) and temperatures (40-300 K), and as a function of the field orientation. The crossovers between in-plane and out-of-plane MR, experimentally observed as a function of either disorder or temperature are well reproduced indicating that disorder and interaction with phonons strongly affect the scattering rate of s-carriers.
Source:	arXiv, arxiv.0706.3591
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